Ko te whakaritenga hoko a te kaihoko ko te whakaputa paipa wai wera (PPR) me te taurangi rewa tata ki te 0.25.
I taunakihia e matou etahi tauira e tika ana, ka mutu ka kowhiria te tauira tino utu nui: PA14D. No te papanga polypropylene tenei tauira, ka whakamahia mo te hanga paipa wai wera.